全文获取类型
收费全文 | 775篇 |
免费 | 38篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 14篇 |
化学工业 | 168篇 |
金属工艺 | 12篇 |
机械仪表 | 30篇 |
建筑科学 | 9篇 |
矿业工程 | 2篇 |
能源动力 | 60篇 |
轻工业 | 42篇 |
水利工程 | 1篇 |
无线电 | 101篇 |
一般工业技术 | 189篇 |
冶金工业 | 76篇 |
原子能技术 | 4篇 |
自动化技术 | 107篇 |
出版年
2024年 | 4篇 |
2023年 | 12篇 |
2022年 | 21篇 |
2021年 | 25篇 |
2020年 | 22篇 |
2019年 | 21篇 |
2018年 | 28篇 |
2017年 | 37篇 |
2016年 | 26篇 |
2015年 | 20篇 |
2014年 | 14篇 |
2013年 | 64篇 |
2012年 | 26篇 |
2011年 | 38篇 |
2010年 | 23篇 |
2009年 | 22篇 |
2008年 | 33篇 |
2007年 | 37篇 |
2006年 | 26篇 |
2005年 | 24篇 |
2004年 | 21篇 |
2003年 | 8篇 |
2002年 | 14篇 |
2001年 | 14篇 |
2000年 | 6篇 |
1999年 | 9篇 |
1998年 | 31篇 |
1997年 | 30篇 |
1996年 | 15篇 |
1995年 | 12篇 |
1994年 | 11篇 |
1993年 | 6篇 |
1992年 | 10篇 |
1991年 | 7篇 |
1990年 | 5篇 |
1989年 | 8篇 |
1988年 | 8篇 |
1987年 | 4篇 |
1986年 | 5篇 |
1984年 | 7篇 |
1982年 | 3篇 |
1981年 | 6篇 |
1979年 | 3篇 |
1978年 | 4篇 |
1977年 | 8篇 |
1976年 | 6篇 |
1975年 | 6篇 |
1974年 | 5篇 |
1973年 | 4篇 |
1971年 | 3篇 |
排序方式: 共有815条查询结果,搜索用时 15 毫秒
81.
Briggs F. Cekleov M. Creta K. Khare M. Kulick S. Kumar A. Lily Pao Looi Natarajan C. Radhakrishnan S. Rankin L. 《Micro, IEEE》2002,22(2):36-47
Architects based the Intel 870 system architecture on the scalability port, a coherent system interconnect. The system's building-block approach lets a single chip set support a wide range of server segments. 相似文献
82.
This paper examines various routes to achieving a 60% carbon emission reduction from the UK housing stock by 2050 compared to 1996, using a new object-oriented housing stock and carbon model, DECarb. As housing is at present responsible for 26% of all UK emissions, housing carbon reduction is likely to be a key component for the overall 60% emission reduction target set by the UK Government's Energy White Paper in 2003. This paper compares 3 independently published sets of scenarios detailing possible routes and suggests that highly disaggregated approaches produce more credible data. The results also show that whilst there are many different routes to achieving the target from a technological standpoint, all of them will require significant shifts in current practice. We investigate other routes to achieving this target, while also meeting nearer term reductions of 50% by 2030. DECarb shows that significant challenges exist in meeting these requirements, though they are technically feasible. On this basis it also becomes clear that the domestic sector will not be able to offset smaller reductions from any other sector of the economy. 相似文献
83.
Several techniques of lumbar disk annulotomy have been described in clinical reports, but have not addressed the influence of annulotomy type on motion-segment stability. The technique used to incise during diskectomy may play a role in the subsequent healing and biomechanical stability of the disk. The purpose of this study is to develop a finite-element model using ADINA to study the influence of annulotomy-technique selection on disk competence. The analyses showed that both the box- and slit-type annular incisions produced similar changes in the biomechanical characteristics of the disk excepting the stresses in the disk annulus. The study also showed that there is no preference between the two annular incisions as far as post-surgical stability of the disk is concerned. 相似文献
84.
Natarajan B. Konstantinides K. Herley C. 《Signal Processing, IEEE Transactions on》1998,46(5):1434-1438
An Occam filter employs lossy data compression to separate signal from noise. Previously, it was shown that Occam filters can filter random noise from deterministic signals. Here, we show that Occam filters can also separate two stochastic sources, depending on their relative compressibility. We also compare the performance of Occam filters and wavelet-based denoising on digital images 相似文献
85.
B. K. Natarajan 《The Visual computer》1989,5(5):316-323
This paper concerns the problem of assembling composite objects. We study the problem on two fronts; Firstly we consider the complexity of deciding the existence of an assembly sequence and show that this is PSPACE-hard in general. Secondly we define a new measure of complexity, one that attempts to measure the minimum number of hands required to assemble a given composite. We analyze various classes of composite objects with respect to this measure. 相似文献
86.
87.
88.
We report for the first time a bidirectional optical backplane bus for a high performance system containing nine multi-chip module (MCM) boards, operating at 632.8 and 1300 nm. The backplane bus reported here employs arrays of multiplexed polymer-based waveguide holograms in conjunction with a waveguiding plate, within which 16 substrate guided waves for 72 (8×9) cascaded fanouts, are generated. Data transfer of 1.2 Gbt/s at 1.3-μm wavelength is demonstrated for a single bus line with 72 cascaded fanouts. Packaging-related issues such as transceiver size and misalignment are embarked upon to provide a reliable system with a wide bandwidth coverage. Theoretical treatment to minimize intensity fluctuations among the nine modules in both directions is further presented and an optimum design rule is provided. The backplane bus demonstrated, is for general-purpose and therefore compatible with such IEEE standardized buses as VMEbus, Futurebus and FASTBUS, and can function as a backplane bus in existing computing environments 相似文献
89.
In this paper we present some issues encountered in the implementation of a kernel for a multiprocessor system using a high level language called CCNPASCAL. We present the nature of the problem concerning each issue, the solutions we adopted and possible better alternatives which we could not adopt for various reasons. 相似文献
90.